Coaxial conduit bulkhead mounting assembly

Abstract

The present invention is directed to a bulkhead mounting assembly comprising a bulkhead-securing flange on an integral body having a large diameter externally threaded portion and a small diameter externally threaded portion with the large diameter externally threaded portion engaging a bulkhead-securing nut of sufficient diameter so as to pass over the small diameter externally threaded portion and an outer coaxial conduit-securing nut engaging the small diameter-threaded portion and preferably any cap placed on an inner coaxial conduit such as used to secure ultra high purity conditions within the inner coaxial conduit.

We claim: 
     
       1. A bulkhead mounting assembly for securing at least two coaxial conduits passing into a bulkhead, comprising; (a) an integral body having a large diameter externally threaded portion and a small diameter externally threaded portion on a single side of said body from where said body is affixed to a bulkhead, a bulkhead-securing flange on the opposite side of said body from where said body is affixed to a bulkhead, and an axial passage through said body to accept coaxially aligned conduits, wherein said large diameter portion is at least greater in diameter than an outer conduit-securing nut engaging said smaller diameter portion;   (b) a bulkhead-securing nut that engages said large diameter threaded portion, and   (c) an outer conduit-securing nut that engages the small diameter threaded portion, said outer conduit-securing nut having a compression seal engaging flange to compress a seal on an outer conduit of coaxial conduits passing into said bulkhead mounting assembly;   (d) a third externally threaded portion on said integral body on the same side of said body as said bulkhead securing flange;   (e) an inner conduit-securing nut that engages the third threaded portion, said inner conduit-securing nut having a compression seal engaging flange to compress a seal on an inner conduit of coaxial conduits passing into said bulkhead mounting assembly.   
     
     
       2. The apparatus of claim 1 wherein said axial passage has a first large diameter section passing partially through a first part of said body to accept said outer conduit and a second small diameter section passing through a second part of said body to accept said inner conduit. 
     
     
       3. The apparatus of claim 2 wherein said axial passage has a third intermediate diameter section between said first large diameter section and said second small diameter section, communicating with an outlet port in said integral body on the same side of said body as said bulkhead securing flange. 
     
     
       4. The apparatus of claim 1 wherein said bulkhead-securing flange has at least two flat surfaces on a peripheral edge to assist in securing it in a bulkhead. 
     
     
       5. The apparatus of claim 4 wherein said peripheral edge has a generally hexagonal shape. 
     
     
       6. The apparatus of claim 1 wherein said bulkhead-securing flange has a circular peripheral edge and said large diameter externally threaded portion has at least two flat surfaces on a peripheral edge. 
     
     
       7. The apparatus of claim 1 wherein said bulkhead-securing flange has a circular peripheral edge and said small diameter externally threaded portion has at least two flat surfaces on a peripheral edge. 
     
     
       8. The apparatus of claim 1 wherein said bulkhead-securing flange has a circular peripheral edge and said assembly has a third portion, with at least two flat surfaces on a peripheral edge, located adjacent said small diameter externally threaded portion and said large diameter externally threaded portion. 
     
     
       9. The apparatus of claim 1 wherein said bulkhead-securing nut has a greater inside diameter than at least an outside diameter of said outer conduit-securing nut. 
     
     
       10. The apparatus of claim 1 wherein said small diameter externally threaded portion is adjacent a side of said large diameter externally threaded portion opposite said bulkhead securing flange. 
     
     
       11. The apparatus of claim 1 wherein said large diameter externally threaded portion is greater in diameter than a cap secured on an end of a conduit passing through said assembly. 
     
     
       12. The apparatus of claim 1 wherein said assembly is stainless steel. 
     
     
       13. The apparatus of claim 1 wherein said assembly is plastic. 
     
     
       14. The apparatus of claim 1 wherein said assembly is brass. 
     
     
       15. The apparatus of claim 1 wherein said assembly includes at least one resilient compression ring seal secured between said small diameter externally threaded portion and said outer conduit-securing nut to secure an outer conduit in said axial passage. 
     
     
       16. The apparatus of claim 15 wherein two interacting seals are secured between said small diameter externally threaded portion and said outer conduit-securing nut. 
     
     
       17. The apparatus of claim 1 wherein the axial passage adjacent said small diameter externally threaded portion has a radially outward tapered surface to engage said seal. 
     
     
       18. The apparatus of claim 1 wherein said assembly includes at least one resilient compression ring seal secured between said third threaded portion and said inner conduit-securing nut to secure an inner conduit in said axial passage. 
     
     
       19. The apparatus of claim 18 wherein two interacting seals are secured between said third threaded portion and said inner conduit securing nut. 
     
     
       20. The apparatus of claim 1 wherein the axial passage adjacent said third externally threaded portion has a radially outward tapered surface to engage said seal.